Aquinox Pharmaceuticals, a Canada clinical-stage pharmaceutical company discovering and developing novel oral drug candidates to treat inflammation and cancer, has listed on Nasdaq as part of an initial public offering. Corporate venturing investors include Johnson & Johnson and Pfizer. The net proceeds of the IPO were about $47m.

Tencent Holdings, the corporate investing unit of China internet group Tencent, has formed a strategic partnership with China e-commerce site, JD.com, which included Tencent acquiring a 15% stake in the business for a reported $214.7m. The move will enable Tencent to gain traction in the China market and beef up its competitiveness against the likes of other internet commerce sites, such as Alibaba.

Samsung Ventures has invested an undisclosed amount in advanced materials company XG Sciences, for it to progress towards the commercialisation of its large-scale graphene applications.

Care.com, a USAA-backed marketplace for housekeeping and care services, raised $91m in its IPO, with a capitalisation of $723m.

Japanese video conferencing company V-cube becomes Intel Capital's sixth portfolio company to list in 2013, as it raises $43m on the Tokyo Stock Exchange.

Inogen, which is backed by Novo and venture firms Versant Ventures, Accuitive Medical Ventures, Avalon Ventures and Arboretum Ventures, has filed for a $86m IPO.

Diagnostics company Oxford Immunotec, backed by Dow Chemical Company and Kaiser Permanente Ventures, raises $62.8m in IPO.

French advertising technology company Criteo raises $250.6m on Nasdaq after twice upping its IPO price and closing higher still.

Social networking service Twitter files IPO registration with a suggested valuation of $12.8bn.